update the comment style from '#' to '//' which is the "un-official"

standard PHP comment.  Also wrap the code in <?php and ?> and finally
add getbinarypageinvar.php to Makefile.am and README

php/examples/Makefile.am

-EXTRA_DIST = README getpageinvar.php simpleget.php simplepost.php
+EXTRA_DIST = README getpageinvar.php getbinarypageinvar.php simpleget.php \
+             simplepost.php

php/examples/getpageinvar.php

-#
-# The PHP curl module supports the received page to be returned in a variable
-# if told.
-#
+<?php
+//
+// The PHP curl module supports the received page to be returned in a variable
+// if told.
+//
 $ch = curl_init();
 
 curl_setopt($ch, CURLOPT_URL,"http://www.myurl.com/");
 curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
 $result=curl_exec ($ch);
 curl_close ($ch);
+?>